@shashin

I was right - a line is missing there from the MSB into the first XOR. I dug out the original question for you - https://gateoverflow.in/167469/isro-2017-ece-computational-circuits. Note that and the AND and OR gates are interchanged.

My approach for these questions will be to simply choose 2 very unique binary values and check the output and compare with known codes. Should not take more than a couple of minutes.

If so, is that a single input XOR there beside the MSB

That is why i posted. So wrong write?

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